A136241 Numbers n among A006093 such that n^2 + n - 1 is prime.

2, 4, 6, 10, 16, 28, 30, 46, 60, 66, 70, 96, 100, 126, 130, 138, 148, 180, 196, 240, 268, 306, 330, 358, 378, 396, 408, 418, 420, 448, 456, 478, 486, 490, 598, 606, 616, 618, 640, 646, 676, 708, 750, 786, 838, 856, 906, 946, 966, 976, 996, 1050, 1060, 1090

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

a(n) = A091567(n) - 1.

Mathematica

Select[Prime[Range[200]]-1, PrimeQ[#^2+#-1]&] (* Harvey P. Dale, Jan 20 2019 *)

Crossrefs

Cf. A136240, A091568.

Sequence in context: A173434 A255126 A052185 * A160444 A158422 A018161

Adjacent sequences: A136238 A136239 A136240 * A136242 A136243 A136244

Keyword

nonn

Author

Lekraj Beedassy, Dec 23 2007

Status

approved